Bar-turning tool.



J. C. POTTER.

ma 'rmmme TOOL.

' APPLICAT'ION FILED DEC. 3, 1906 v v 1 128,605 Patented "June 4,1912.

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J. G. POTTER. 7

BAR TURNING TOOL.

APPLIOATIOB Hum D20. 3, 190a.

, Patented June 4, 1912. 4

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BAR TURNING TOOL.

. urnmuxqn nun mm. a, 1906.

' Patented June 4, 1912.

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mvchi'oz lvilmeo'qao UNITED sTAT s PATENT oEEIo 1 A JAMES cHAELES POTTER, or PAWTUCKET, RHODE ISLAND, ASSIGNOR TO PoTTEE & r v

JOHNSTON MACHINE 00., 0E PAWTUCKET, RHODE ISLAND, A coRPoEATIoN 0F RHQDE ISLAND.

To all whom it'may concern:

Be it known that'I, JAMES Pawtucket, in the county of Providence and in the State of Rhode Island, haveinvented a certain new and useful Improvement in Bar-Turning Tools, and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to The object of my invention is to provide a turning tool by which, in automatic lathes,

or shaping n1achines,=the cutting can be done beginning at a point at or near the chuck and proceeding therefrom outward, and to this end my said invention consists in the construction and combination of parts here inafter specified and claimed.

In automatic-lathes, as heretofore constructed, the cutting has proceeded from the outer portion of the work inward, 'or toward the chuck; a'j'procedure which results in inferior or naccurate work, especlally where the piece operated onis long and'slender, because the thrust of the cutting tool thereon causes it to move orbend laterally. By my invention I avoid this efiect of'the. tool on the work.

I illustrate my invention as adapted toan automatic turret lathe, of'well-k-nown construction, having a suitable frame A, head stock B, and tool turret G mounted. on a reciprocating slide D, by which the turret is moved toward ,and' from the work in the chuck E. Secured to the turret, in a comthe usual. holes in the turret, is'iny turning tool which comprises a head F from which the shank f projects, and two similar, semicylindrical blocks f that are hinged or pivoted at one end to the head with their flat sides toward each other, so that, when pressed together, the two blocks will be perfectly cylindrical. One of the blocks, on its forward end, carries a cuttingtool G, while the other carries a pair ofwork-engaging shoes G, the cutting tool and shoes engaging the work when the two blocks are pressed together, and being out of engagement therewith when the two blocksw are Specification'of Letters Patent. i

C. POTTER, of-

I interpose a device between the turret and AR-TURNING TQOL.

, Patented June-4', 1912.

Application filed necember 3, 1906. Serial No; 346,086.

swung apart. The two blocks are yieldingly swung and held apart by means of a. spring,- which may be a coil spring f interposed between themnear their outer ends, and as automatic means are-provided, to close them,

it will be seen that thecutting tool and shoes are ,au'toma'tically placed in and outof op erating position. H v L 1 For automatically closing the two blocks,

head stock that consists of'a pair of semicircular, opposed, jaws H, mounted to slidev I I transversely of the machine toward and )from eachother, to close upon and release, 1

the two bloc'ks f., ,When closed upon them they are pressed-together to form a cylinder that'closely fits the circular jaw openings-,

and the cutting tool thereby maintained in cuttingposition duringtravel overthe work by the movement of the turret slide. :i Thejaws H are mounted upon a block or bedI extending transversely ofthe machine, and

each jaw is providedwith a threaded-open ing or nut through which passes a screw 1 having right and left thread to engage the respective jaw nuts so as to cause themto, approach or recede from each other, accord-. ing to the direction of revolution of the screw. On the end of the screw, at the rear of the machine, :is a pinion K, with which meshes a gear segment L; pivoted to bracket M, the Segment having an arm carrymg an anti-friction roller m which 1s I engaged by cam plates n on a drum N, the cam plates, by the revolution of the drum, acting torock'the gear segment L and there- 'by revolve the screw in one direction'o-r thc i other, toclose or open the jaws Hin propertime.

In the use of the embodiment ofmy invention which I have shown and described,

the work which, as shown, may be along,

slender, rod-like piece 10 having a head 11, after having been turned downv a short distance from its head, is secured by its head in the chuck. vancing toward the work, the blocks f. BX panded, or-spread apart by the spring F, are moved or passed between theyjaws H, which are opened, or separated for their passage, and over the work 10, until they reach the point where the cutter is to begin work, whereupon the jaws H are automatically moved together by the action of the cam drum ,N, to. close the blocks and place The turret, then adwill automatically open atthe the cutterin' opeiating position on the work,

whereupon the return movement of the turret slide will begin and the cutting proceed outward from the chuck toward the end of the work farthest therefrom, and the cutting, having been completed, the jaws H and the blocks f will expand.

It, of course, will be understood that the particular construction and arrangement of parts which are shown in the drawings and described herein, is to be taken as illustrative of one embodiment of my invention,

and not as being the only embodiment, and

the scope of'my ap )endjed' claims is to be.

from the work during its travel toward the chuck, and automatic means to move said tool carrier laterally to place the tool in contact with the work when the travel toward the chuck reaches a predetermined point, the tool being inactive on the work when in its position away therefrom and cutting \vhcn it is in its inward )osition, and said --lide, in one direction oi travel, carrying :he tool in a direction from the free end of the work toward the chuck,

during which time the tool is inactive, and

in its other direction of.,travel carrying the tool along'the work during a cutting operation.

2. The combination of a chuck adapted to support work at one end, a slide traversin which the chuck axis lies, a laterally movable tool carrier pivotally mounted at one end on said slide and extending forward therefrom and carrying a tool at its forward free end, means for maintaining the tool proper time 1 said tool carrier laterally to place the tool in contact with the work when the travel toward thechuck reaches. a predetermined point, the tool being inactive on the work when in its position away therefrom and cutting'when it is in its inward position, and said slide, in one direction 0 travel, carrying the tool in a direction fromthe free end of the work toward the chuck,

tion.

'3. The combination of a chuck adapted to support work at one end, a slide traversable in a path that lies in thesame direction in which thechuck axis lies, a laterally mov-- able tool carrier mounted at one end on said slide and extending forward therefrom and carrying a tool at its forward free end, said tool carrier'comprisi'ng two members situated on opposite sides of the work in the chuck, a pair of jaws movable crosswise of the path of travel of the slide situated to engage the tool carrier members when a predetermined point in the travel toward the. chuck is reached, and automatic means to reciprocate said jaws.

4. The combination ;of' a chuck adapted to support work at one end, a turret traversable in a path that lies in the same direction in which the chuck axis lies, a tool car- -rier composed of two members pivotally mounted at one end on the turret and projecting free therefrom on opposite sides of the work, said tool carrier having a tool at its forward free end, a spring device normally spreading said members apart, and a pair of jaws located on opposite sides of said carrier and movable toward and n from the same. able in a path that lies in the same direction In testimony that I claim the foregoing I have hereunto set my-hand. I

1 JAMES CHARLES POTTERV Witnesses:

MITCHELL ADAMS, CHAS. H. W. Ronnn'jrs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

during which time the tool is inactive, and 

